Added optional Lua lexer support.

This support is disabled by default and must be enabled via compile-time option.

1 files changed, 53 insertions, 0 deletions

diff --git a/lexlua/vb.lua b/lexlua/vb.lua
new file mode 100644
index 000000000..170b49321
--- /dev/null
+++ b/lexlua/vb.lua
@@ -0,0 +1,53 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- VisualBasic LPeg lexer.
+
+local lexer = require('lexer')
+local token, word_match = lexer.token, lexer.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local lex = lexer.new('vb')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match([[
+  -- Control.
+  If Then Else ElseIf While Wend For To Each In Step Case Select Return Continue
+  Do Until Loop Next With Exit
+  -- Operators.
+  Mod And Not Or Xor Is
+  -- Storage types.
+  Call Class Const Dim ReDim Preserve Function Sub Property End Set Let Get New
+  Randomize Option Explicit On Error Execute
+  -- Storage modifiers.
+  Private Public Default
+  -- Constants.
+  Empty False Nothing Null True
+]], true)))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match([[
+  Boolean Byte Char Date Decimal Double Long Object Short Single String
+]], true)))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT,
+                              (P("'") + word_match([[rem]], true)) *
+                              lexer.nonnewline^0))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING,
+                             lexer.delimited_range('"', true, true)))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
+                                           S('LlUuFf')^-2))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('=><+-*^&:.,_()')))
+
+return lex